.container {
    width: 300px;
    padding: 16px;
}

h2 {
    margin: 0 0 16px;
    text-align: center;
}

.theme-presets {
    display: grid;
    gap: 8px;
    margin-bottom: 20px;
}

.theme-btn {
    padding: 8px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.theme-btn:hover {
    opacity: 0.9;
}

.custom-colors {
    border-top: 1px solid #ddd;
    padding-top: 16px;
}

.color-picker {
    display: flex;
    align-items: center;
    margin: 8px 0;
    gap: 8px;
}

#applyCustom {
    width: 100%;
    margin-top: 16px;
    padding: 8px;
    background: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}